aws-sam-cli: aws-sam-cli-managed-default stack rolled back with "The specified bucket is not valid" error

Description:

When setting up a new sam project using sam init, then sam build and then sam deploy --guided, the Cloud Formation process fails with:

Error: Failed to create managed resources: Waiter StackCreateComplete failed: Waiter encountered a terminal failure state: For expression “Stacks[].StackStatus” we matched expected path: “ROLLBACK_COMPLETE” at least once

Steps to reproduce:

$ sam init
Which template source would you like to use?
	1 - AWS Quick Start Templates
	2 - Custom Template Location
Choice: 1
What package type would you like to use?
	1 - Zip (artifact is a zip uploaded to S3)
	2 - Image (artifact is an image uploaded to an ECR image repository)
Package type: 1

Which runtime would you like to use?
	1 - nodejs14.x
	2 - python3.9
	3 - ruby2.7
	4 - go1.x
	5 - java11
	6 - dotnetcore3.1
	7 - nodejs12.x
	8 - nodejs10.x
	9 - python3.8
	10 - python3.7
	11 - python3.6
	12 - python2.7
	13 - ruby2.5
	14 - java8.al2
	15 - java8
	16 - dotnetcore2.1
Runtime: 1

Project name [sam-app]: github-test-case

Cloning from https://github.com/aws/aws-sam-cli-app-templates

AWS quick start application templates:
	1 - Hello World Example
	2 - Step Functions Sample App (Stock Trader)
	3 - Quick Start: From Scratch
	4 - Quick Start: Scheduled Events
	5 - Quick Start: S3
	6 - Quick Start: SNS
	7 - Quick Start: SQS
	8 - Quick Start: Web Backend
Template selection: 1

    -----------------------
    Generating application:
    -----------------------
    Name: github-test-case
    Runtime: nodejs14.x
    Dependency Manager: npm
    Application Template: hello-world
    Output Directory: .

    Next steps can be found in the README file at ./github-test-case/README.md

$ cd github-test-case
$ sam deploy --guided --debug
2021-09-04 22:54:55,157 | Telemetry endpoint configured to be https://aws-serverless-tools-telemetry.us-west-2.amazonaws.com/metrics
2021-09-04 22:54:55,158 | Using config file: samconfig.toml, config environment: default
2021-09-04 22:54:55,158 | Expand command line arguments to:
2021-09-04 22:54:55,158 | --guided --template_file=/Users/nrj/Projects/github-test-case/template.yaml --stack_name=sam-app --fail_on_empty_changeset

Configuring SAM deploy
======================

	Looking for config file [samconfig.toml] :  Not found

	Setting default arguments for 'sam deploy'
	=========================================
	Stack Name [sam-app]: github-test-case
	AWS Region [eu-west-2]:
2021-09-04 22:55:01,053 | No Parameters detected in the template
2021-09-04 22:55:01,080 | 2 stacks found in the template
	#Shows you resources changes to be deployed and require a 'Y' to initiate deploy
	Confirm changes before deploy [y/N]:
	#SAM needs permission to be able to create roles to connect to the resources in your template
	Allow SAM CLI IAM role creation [Y/n]:
2021-09-04 22:55:03,600 | No Parameters detected in the template
2021-09-04 22:55:03,628 | 2 resources found in the stack
2021-09-04 22:55:03,628 | No Parameters detected in the template
2021-09-04 22:55:03,651 | Found Serverless function with name='HelloWorldFunction' and CodeUri='hello-world/'
2021-09-04 22:55:03,651 | --base-dir is not presented, adjusting uri hello-world/ relative to /Users/nrj/Projects/github-test-case/template.yaml
2021-09-04 22:55:03,651 | No Parameters detected in the template
2021-09-04 22:55:03,675 | Detected Inline Swagger definition
2021-09-04 22:55:03,675 | Auth checks done on swagger are not exhaustive!
	HelloWorldFunction may not have authorization defined, Is this okay? [y/N]: y
2021-09-04 22:55:05,117 | No Parameters detected in the template
2021-09-04 22:55:05,148 | 2 resources found in the stack
2021-09-04 22:55:05,148 | No Parameters detected in the template
2021-09-04 22:55:05,171 | Found Serverless function with name='HelloWorldFunction' and CodeUri='hello-world/'
2021-09-04 22:55:05,171 | --base-dir is not presented, adjusting uri hello-world/ relative to /Users/nrj/Projects/github-test-case/template.yaml
2021-09-04 22:55:05,171 | No function or layer definition found with code sign config, skipping
	Save arguments to configuration file [Y/n]:
	SAM configuration file [samconfig.toml]:
	SAM configuration environment [default]:

	Looking for resources needed for deployment:
2021-09-04 22:55:08,406 | Managed S3 stack [aws-sam-cli-managed-default] not found. Creating a new one.
	Creating the required resources...
2021-09-04 22:55:39,246 | Failed to create managed resources
Traceback (most recent call last):
  File "/usr/local/Cellar/aws-sam-cli/1.30.0/libexec/lib/python3.8/site-packages/samcli/lib/utils/managed_cloudformation_stack.py", line 107, in _create_or_get_stack
    stack = _create_stack(
  File "/usr/local/Cellar/aws-sam-cli/1.30.0/libexec/lib/python3.8/site-packages/samcli/lib/utils/managed_cloudformation_stack.py", line 180, in _create_stack
    stack_waiter.wait(StackName=stack_id, WaiterConfig={"Delay": 15, "MaxAttempts": 60})
  File "/usr/local/Cellar/aws-sam-cli/1.30.0/libexec/lib/python3.8/site-packages/botocore/waiter.py", line 53, in wait
    Waiter.wait(self, **kwargs)
  File "/usr/local/Cellar/aws-sam-cli/1.30.0/libexec/lib/python3.8/site-packages/botocore/waiter.py", line 350, in wait
    raise WaiterError(
botocore.exceptions.WaiterError: Waiter StackCreateComplete failed: Waiter encountered a terminal failure state: For expression "Stacks[].StackStatus" we matched expected path: "ROLLBACK_COMPLETE" at least once
2021-09-04 22:55:39,248 | Sending Telemetry: {'metrics': [{'commandRun': {'requestId': 'db327d08-08a0-4f89-8a28-983e73244651', 'installationId': 'ff7e8c7e-a91e-453d-a62a-c57922b8ef47', 'sessionId': '23501a9e-26a9-428b-a77a-4761f0c4f8f3', 'executionEnvironment': 'CLI', 'ci': False, 'pyversion': '3.8.12', 'samcliVersion': '1.30.0', 'awsProfileProvided': False, 'debugFlagProvided': True, 'region': '', 'commandName': 'sam deploy', 'duration': 44088, 'exitReason': 'ManagedStackError', 'exitCode': 1}}]}
2021-09-04 22:55:39,955 | HTTPSConnectionPool(host='aws-serverless-tools-telemetry.us-west-2.amazonaws.com', port=443): Read timed out. (read timeout=0.1)
Error: Failed to create managed resources: Waiter StackCreateComplete failed: Waiter encountered a terminal failure state: For expression "Stacks[].StackStatus" we matched expected path: "ROLLBACK_COMPLETE" at least once

Observed result:

The following error on the CLI:

Error: Failed to create managed resources: Waiter StackCreateComplete failed: Waiter encountered a terminal failure state: For expression “Stacks[].StackStatus” we matched expected path: “ROLLBACK_COMPLETE” at least once

An event on SamCliSourceBucketBucketPolicy in status CREATE_FAILED with error:

The specified bucket is not valid. (Service: Amazon S3; Status Code: 400; Error Code: InvalidBucketName; Request ID: RT87VR3Q5R82GMEN; S3 Extended Request ID: rD6481ZT7Xx0iMSXqKLIOg7Hwz/5PKMjA/FKqWze8fl7AQ16NCaDRnMuIEL5O0zrFQyQPnHonhU=; Proxy: null)

Expected result:

I’m not familiar with this tool, but I assume a working project?

Additional environment details (Ex: Windows, Mac, Amazon Linux etc)

1. OS: macOS 11.5.1 (20G80)
2. sam --version: SAM CLI, version 1.30.0
3. AWS region: eu-west-2